The article is documenting the first empirical testing of ComTrans - a theory driven concept for competence diagnostics and competence oriented teaching. Therefore a preliminary model of the 'competence to evaluate actions ethically' was reconstructed and tested with the help of two ethics teachers in four classes in a German secondary school. The basis of our competency model was the current curriculum for the school subject ethics in the Free State of Saxonia. Because of practical reasons we were only able to create and test a teaching unit that involved six forty-five minute lessons. In those lessons the pupils learned how to evaluate their action-decisions and how to verify their judges by considering the basic ethical positions of Kant's categorical imperative and the utilitaristic principle the greatest good for the greatest number. At the end of the teaching unit the pupils were given a test, which was developed on the basis of the competency model. Additionally the test was analysed in four ways: criterion referenced, with the classical test theory and with the latent trait models of Rasch and Birnbaum. The results of these analyses are compared and discussed. (DIPF/Orig.)